1491630791969 has 2 divisors, whose sum is σ = 1491630791970. Its totient is φ = 1491630791968.

The previous prime is 1491630791923. The next prime is 1491630792017. The reversal of 1491630791969 is 9691970361941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 788233230625 + 703397561344 = 887825^2 + 838688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491630791969 - 2⁸ = 1491630791713 is a prime.

It is a super-2 number, since 2×1491630791969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1491630791669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745815395984 + 745815395985.

It is an arithmetic number, because the mean of its divisors is an integer number (745815395985).

Almost surely, 2^{1491630791969} is an apocalyptic number.

It is an amenable number.

1491630791969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491630791969 is an equidigital number, since it uses as much as digits as its factorization.

1491630791969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19840464, while the sum is 65.

The spelling of 1491630791969 in words is "one trillion, four hundred ninety-one billion, six hundred thirty million, seven hundred ninety-one thousand, nine hundred sixty-nine".